GoogleCloudPlatform / esp-v2 - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 639 units with 10,568 lines of code in units (58.0% of code).

2 very complex units (363 lines of code)
2 complex units (207 lines of code)
21 medium complex units (1,141 lines of code)
93 simple units (2,971 lines of code)
521 very simple units (5,886 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
def gen_proxy_config() in docker/generic/start_proxy.py	288	97	1
def enforce_conflict_args() in docker/generic/start_proxy.py	75	54	1
func NewConfigManager() in src/go/configmanager/config_manager.go	104	39	2
void FillLogEntry() in src/api_proxy/service_control/request_builder.cc	103	26	5
Status ConvertCheckResponse() in src/api_proxy/service_control/check_response_convert_utils.cc	106	25	3
void ServiceControlFilterStats::collectCallStatus() in src/envoy/http/service_control/filter_stats.cc	58	18	2
func NewServiceInfoFromServiceConfig() in src/go/configinfo/service_info.go	64	18	2
func() in src/go/configinfo/service_info.go	67	18	1
Status RequestBuilder::FillReportRequest() in src/api_proxy/service_control/request_builder.cc	48	17	2
func() in src/go/util/httppattern/sort_impl.go	58	15	1
func ParseHTTPPatternsBySelectorFromOPConfig() in src/go/configgenerator/routegen/util.go	58	14	2
func() in src/go/configgenerator/filtergen/service_control.go	86	14	1
func() in src/go/configinfo/service_info.go	43	13	1
func() in src/go/configgenerator/clustergen/helpers/backend.go	50	13	1
func GetIgnoredQueryParamsFromOPConfig() in src/go/configgenerator/filtergen/grpc_transcoder.go	45	13	2
void fillLatency() in src/envoy/http/service_control/handler_utils.cc	39	12	3
func() in src/go/configgenerator/filtergen/jwt_authn.go	79	12	1
Status RequestBuilder::AppendByConsumerOperations() in src/api_proxy/service_control/request_builder.cc	33	11	3
func() in src/go/util/httppattern/uri_template.go	36	11	1
func CreateCommonTlsContext() in src/go/util/transport_socket.go	47	11	6
func() in src/go/configgenerator/filtergen/filtergentest/filtergentest.go	39	11	1
func UpdateProtoDescriptorFromOPConfig() in src/go/configgenerator/filtergen/grpc_transcoder.go	41	11	3
func IsSchemeHeaderOverrideRequiredForOPConfig() in src/go/configgenerator/filtergen/http_connection_manager.go	41	11	2
func TokenSource() in src/go/gcsrunner/serviceaccount.go	61	11	2
def gen_args() in docker/serverless/env_start_proxy.py	42	11	1
bool extractAPIKey() in src/envoy/http/service_control/handler_utils.cc	29	10	3
absl::StatusOr extractIPFromForwardedHeader() in src/envoy/http/service_control/handler_utils.cc	37	10	1
func() in src/go/configinfo/service_info.go	34	10	1
func() in src/go/configinfo/service_info.go	50	10	1
func() in src/go/configgenerator/routegen/proxy_backend.go	46	10	1
func NewGRPCTranscoderFilterGenFromOPConfig() in src/go/configgenerator/filtergen/grpc_transcoder.go	50	10	3
func GenTranslationInfoFromOPConfig() in src/go/configgenerator/filtergen/path_rewrite.go	32	10	2
func main() in src/go/gcsrunner/main/runner.go	56	10	0
func StartEnvoyAndWait() in src/go/gcsrunner/start_envoy.go	49	10	2
Status RequestBuilder::FillAllocateQuotaRequest() in src/api_proxy/service_control/request_builder.cc	41	9	2
void TokenSubscriber::processResponse() in src/envoy/token/token_subscriber.cc	50	9	1
Envoy::Http::RequestMessagePtr IamTokenInfo::prepareRequest() in src/envoy/token/iam_token_info.cc	38	9	1
void ClientCache::initHttpRequestSetting() in src/envoy/http/service_control/client_cache.cc	34	9	1
void ClientCache::handleCheckResponse() in src/envoy/http/service_control/client_cache.cc	57	9	3
FilterHeadersStatus Filter::decodeHeaders() in src/envoy/http/path_rewrite/filter.cc	66	9	2
func() in src/go/configinfo/service_info.go	47	9	1
func() in src/go/util/httppattern/uri_template_parser.go	28	9	1
func determineBackendClusterForSelector() in src/go/configgenerator/routegen/util.go	32	9	4
func GetQuotaAndUsageRequirementsFromOPConfig() in src/go/configgenerator/filtergen/service_control.go	41	9	2
func IsGRPCSupportRequiredForOPConfig() in src/go/configgenerator/filtergen/util.go	26	9	2
func() in src/go/configgenerator/filtergen/http_connection_manager.go	91	9	1
func MakeListener() in src/go/configgenerator/listener_generator.go	64	9	4
Status ConvertAllocateQuotaResponse() in src/api_proxy/service_control/check_response_convert_utils.cc	33	8	3
Status RequestBuilder::FillCheckRequest() in src/api_proxy/service_control/request_builder.cc	36	8	2
void PathMatcherNode::LookupPath() in src/api_proxy/path_matcher/path_matcher_node.cc	29	8	4